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PDF UAA2016 Data sheet ( Hoja de datos )
| Número de pieza | UAA2016 | |
| Descripción | ZERO VOLTAGE SWITCH POWER CONTROLLER | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de UAA2016 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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Zero Voltage Switch
Power Controller
The UAA2016 is designed to drive triacs with the Zero Voltage technique
which allows RFI–free power regulation of resistive loads. Operating directly
on the AC power line, its main application is the precision regulation of
electrical heating systems such as panel heaters or irons.
A built–in digital sawtooth waveform permits proportional temperature
regulation action over a ±1°C band around the set point. For energy savings
there is a programmable temperature reduction function, and for security a
sensor failsafe inhibits output pulses when the sensor connection is broken.
Preset temperature (i.e. defrost) application is also possible. In applications
where high hysteresis is needed, its value can be adjusted up to 5°C around
the set point. All these features are implemented with a very low external
component count.
• Zero Voltage Switch for Triacs, up to 2.0 kW (MAC212A8)
• Direct AC Line Operation
• Proportional Regulation of Temperature over a 1°C Band
• Programmable Temperature Reduction
• Preset Temperature (i.e. Defrost)
• Sensor Failsafe
• Adjustable Hysteresis
• Low External Component Count
Order this document by UAA2016/D
UAA2016
ZERO VOLTAGE SWITCH
POWER CONTROLLER
SEMICONDUCTOR
TECHNICAL DATA
8
1
P SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
PIN CONNECTIONS
3
Sense Input
4
Temperature
Reduction
Representative Block Diagram
Failsafe
+
–
++
+
1/2
Sampling
Full Wave
Logic
UAA2016
Pulse
Amplifier
Internal
Reference
6
Output
7
+VCC
Vref 1
Hys. Adj. 2
Sensor 3
Temp. Reduc. 4
8 Sync
7 VCC
6 Output
5 VEE
(Top View)
2
Hysteresis
Adjust
1
Voltage
Reference
4–Bit DAC
Synchronization
11–Bit Counter
8
Sync
Supply
Voltage
5
VEE
This document contains information on a product under development. Motorola reserves the
rigMhtOtoTcOhaRngOeLorAdisAcNonAtinLuOe tGhisICproDduEcVt wICithEouDt nAoTtiAce.
ORDERING INFORMATION
Device
Operating
Temperature Range
Package
UAA2016D
TA = – 20° to +85°C
UAA2016P
SO–8
Plastic DIP
© Motorola, Inc. 1996
Issue 5
1
1 page  
UAA2016
CIRCUIT FUNCTIONAL DESCRIPTION
Power Supply (Pin 5 and Pin 7)
The application uses a current source supplied by a single
high voltage rectifier in series with a power dropping resistor.
An integrated shunt regulator delivers a VEE voltage of
– 8.6 V with respect to Pin 7. The current used by the total
regulating system can be shared in four functional blocks: IC
supply, sensing bridge, triac gate firing pulses and zener
current. The integrated zener, as in any shunt regulator,
absorbs the excess supply current. The 50 Hz pulsed supply
current is smoothed by the large value capacitor connected
between Pins 5 and 7.
Temperature Sensing (Pin 3)
The actual temperature is sensed by a negative
temperature coefficient element connected in a resistor
divider fashion. This two element network is connected
between the ground terminal Pin 5 and the reference voltage
– 5.5 V available on Pin 1. The resulting voltage, a function of
the measured temperature, is applied to Pin 3 and internally
compared to a control voltage whose value depends on
several elements: Sawtooth, Temperature Reduction and
Hysteresis Adjust. (Refer to Application Information.)
Temperature Reduction
For energy saving, a remotely programmable temperature
reduction is available on Pin 4. The choice of resistor R1
connected between Pin 4 and VCC sets the temperature
reduction level.
Comparator
When the positive input (Pin 3) receives a voltage greater
than the internal reference value, the comparator allows the
triggering logic to deliver pulses to the triac gate. To improve
the noise immunity, the comparator has an adjustable
hysteresis. The external resistor R3 connected to Pin 2 sets
the hysteresis level. Setting Pin 2 open makes a 10 mV
hysteresis level, corresponding to 0.15°C. Maximum
hysteresis is obtained by connecting Pin 2 to VCC. In that
case the level is set at 5°C. This configuration can be useful
for low temperature inertia systems.
Sawtooth Generator
In order to comply with European norms, the ON/OFF
period on the load must exceed 30 seconds. This is achieved
by an internal digital sawtooth which performs the
proportional regulation without any additional component.
The sawtooth signal is added to the reference applied to the
comparator negative input. Figure 2 shows the regulation
improvement using the proportional band action.
Noise Immunity
The noisy environment requires good immunity. Both the
voltage reference and the comparator hysteresis minimize
the noise effect on the comparator input. In addition the
effective triac triggering is enabled every 1/3 sec.
Failsafe
Output pulses are inhibited by the “failsafe” circuit if the
comparator input voltage exceeds the specified threshold
voltage. This would occur if the temperature sensor circuit is
open.
Sampling Full Wave Logic
Two consecutive zero–crossing trigger pulses are
generated at every positive mains half–cycle. This ensures
that the number of delivered pulses is even in every case.
The pulse length is selectable by Rsync connected on Pin 8.
The pulse is centered on the zero–crossing mains waveform.
Pulse Amplifier
The pulse amplifier circuit sinks current pulses from Pin 6
to VEE. The minimum amplitude is 70 mA. The triac is then
triggered in quadrants II and III. The effective output current
amplitude is given by the external resistor Rout. Eventually,
an LED can be inserted in series with the Triac gate (see
Figure 1).
200
180
160
140
120
100
80
60
40
20
Figure 4. Output Resistor versus
Triac Gate Current
TA = +10°C
TA = – 20°C
TA = 0°C
TA = –10°C
30 40 50
IGT, TRIAC GATE CURRENT SPECIFIED AT 25°C (mA)
60
Figure 5. Minimum Output Current
versus Output Resistor
100
80
60
40
TA = + 85°C
20 TA = – 20°C
0
40 60 80 100 120 140 160 180 200
Rout, OUTPUT RESISTOR (Ω)
MOTOROLA ANALOG IC DEVICE DATA
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet UAA2016.PDF ] | |
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